PCI (Peripheral Component Interconnect) device INTx interruption delivery method for computer virtualization system

Abstract

The invention discloses a PCI (Peripheral Component Interconnect) device INTx interruption delivery method for a computer virtualization system. The implementation steps include that an internal device interruption information record is generated, and each device initialization data variable is recorded; a virtual machine is started to acquire a device with direct access permission according to the internal device interruption information record, for device registered interruption number and interruption signal processing routine, a virtual machine monitor is requested to fill the interruption purpose and interruption target of the device with direct access permission of the virtual machine; the virtual machine monitor receives the current INTx interruption request of the device and delivers the current INTx interruption request to an interruption target virtual machine in the device matched data variable record. The PCI device INTx interruption delivery method for the computer virtualization system has the advantages that the direct IO technology of the virtual machine is supported, no side effect is generated to other virtual machines besides the target virtual machine, the safety and isolation properties are good, the interruption performance is high, the application compatibility is good, the overhead is small, and no extra hardware mechanism support is needed.

Description

technical field [0001] The invention relates to a device interrupt delivery mechanism and management method in computer virtualization technology, in particular to a PCI device INTx interrupt delivery method of a computer virtualization system. Background technique [0002] Virtualization technology has been widely used in the computer field. The current virtualization technology can be divided into two categories. One is to establish multiple virtual machine environments by partitioning or multiplexing redundant resources on a single physical machine. The other is to integrate multiple physical machine resources to establish a unified computer environment with more powerful capabilities. The technical contents of the present invention and terms such as "virtualization technology" involved are generally oriented to virtualization on a single physical computer system. [0003] Virtualization technology introduces a new software level (also known as privilege level or running...

AI Technical Summary

Problems solved by technology

First of all, the number of IO devices is generally limited, and it is not easy to share them with virtual machines in time or in segments

Second, IO devices are indeterminate to the system, since hotplug events and faults on the bus are allowed to retire

Third, the management of devices on the standard PCI bus has a strong correlation, and the initialization of all devices on it must be completed in one scan. It is difficult for VMM to directly allocate different devices to each virtual machine, and it is even more difficult to allocate time-sharing devices

Fourth, there are many types of IO devices, and the reliability of the driver is poor, which is usually directly driven by the virtual machine operating system

Most computers will use the PCI series bus to connect IO devices. Some IO devices need the support of INTx interrupts, but INTx interrupts are shared by IO devices, and it is impossible to judge the interrupt source device and interrupt target based on the interrupt information.

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